Palomar Observatory

They also made new observations of the inner planets in the system, including with the Hubble Space Telescope and the California Institute of Technology's Palomar Observatory telescope, and obtained archival data from several ground-based telescopes.

It took less than two minutes for the ultra high-definition video to reach Caltech’s Palomar Observatory, sent at the test system’s maximum rate of 267 megabits per second.

Mr Rogalin said the connection over which the video was sent from the Palomar observatory to the JPL base was actually slower than the signal transmitting the clip from space.

The video was received by the Hale telescope at the Palomar observatory, where it was downloaded.

Janus was spotted using the Zwicky Transient Facility at Caltech's Palomar Observatory near San Diego, with subsequent observations made by other ground-based telescopes.